If the weight is about 200 kg, it is ok to lose 20 kg in 65 days. Weight 120 kg, 65 days is probably enough to lose 20 kg. According to your height and weight, calculate how many calories you naturally consume every day even if you don't exercise, and then control your daily calorie intake to a quarter of this value (full stomach, low calorie+high calorie to relieve hunger, no loss in your mouth, no hard work at all). Badminton is the best sport, 2 hours a day, continuously, not playing for 2 hours a day. One thing to pay attention to is to drink water after exercise, not during exercise, not at any time, just plain water. Weigh yourself after defecation every morning, and you can steadily lose weight from the tenth day. If you weigh 200 kg, you are expected to lose 150-250 g every day.